import java.util.HashSet;
import java.util.Set;
public class Main {
/**
* Returns the intersection of two sets without modifying the original sets.<p>
*
* @param <A> the type of objects contained in the sets
*
* @param first the first set
* @param second the second set
*
* @return the intersection of both sets
*/
public static <A> Set<A> intersection(Set<A> first, Set<A> second) {
HashSet<A> result = new HashSet<A>(first);
result.retainAll(second);
return result;
}
}
